what is it effect on pipe &pressure chart of the the phenomena and how can avoid it?
2006-11-27 12:57:47 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Water-hammer is the effect of non-compressibility of fluids and the physics of kinetic energy. It is avoided by providing damping in the system (most commonly an air cushion in the system) that will allow the kinetic energy of the fluid to be damped out and absorbed, rather than being transferred to the pipe system as an impulse (like a freight train hitting a barricade). The air cushion allows the fluid to decelerate gradually. Pipe friction in the cushion provides energy absorption, as well.
2006-11-27 13:09:52 · answer #1 · answered by www.HaysEngineering.com 4 · 0⤊ 0⤋
Waterhammer happens when water gets some momentum and a valve is suddenly shut. The entire pipe full of water has to stop very quickly and develops a high pressure ... sometimes bursting pipes. You can avoid it by turning valves off slowly.
Hydroelectric plants have to be very aware of water momentum. Pressure relief valves are installed to prevent both water hammer and the opposite effect of the water causing a vacuum on the other side of a valve.
Some pumps use water hammer to deliver water to a high elevation when there is only a small drop in a stream. The pumps get the water moving, then shut off a valve quickly. The high pressure water gets directed through a check valve and up to a tank.
2006-11-27 13:09:39 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Water hammer is result of water flowing through pipes suddenly coming to a stop as in a quick closing valve. Slow closing valves are one way and arrestors are another. The pressure is a function of the velocity of the water and length of the pipe. But can be many times the system pressure and can cause overpressure damage to piping.
2016-03-28 22:17:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
It's bad for the pipes because the pressure can get very high. To avoid it, you need air cushions. These are vertical pipes, capped off, so air is trapped in them. When water is shut off, it will jump up in the pipe, but the trapped air cushions it. The pressure will rise, but more smoothly and not as high. They get waterlogged because the water will eventually dissolve the air and carry it away. Then the pipe needs to be drained to trap more air in them.
2006-11-27 13:06:02 · answer #4 · answered by Anonymous · 0⤊ 0⤋
confusing factor. research using yahoo. this can help!
2015-03-17 16:41:17 · answer #5 · answered by ernest 2 · 0⤊ 0⤋